Thermodynamics laboratory

Climate chambers

The competence area of ​​thermal energy systems has three climatic chambers. The two large climatic chambers can be used separately from each other or in combination.

Single unit test setups and test stands can be tested under various climatic conditions. As a combination, the climatic chambers can be applied e.g.  as heat sources and heat sinks for heat pumps testing.

The smallest climate chamber, also known as a climate control system, can be used very flexibly. This climate chamber was developed and assembled by the Institute for Energy Systems IES.

Climate chambers

Noise-reduced climate chambers

Measurement of the sound power level can be carried out in our laboratory and in the field according to the international standards EN ISO 9614-1 and 9614-2.

Sound pressure measurements in the low-reflection sound chamber and in the field.

Frequency band analyses of 10 to 20000 Hz by means of sound pressure or sound intensity measurements for the determination of interfering frequencies of a machine.

Software for the determination of overtones in a machine to minimize the transmission of structure-borne sounds in the system.

Noise-reduced climate chamber

Vacuum pump test bench

A vacuum pump is characterized, among other things, by its characteristic curve relating the relationship between the suction pressure and the suction capacity.

In order to determine such vacuum pump characteristic curves, a test bench was constructed for vacuum pumps with nominal pumping capacities of approx. 20 to 120 m3/h.

The test bench allows measurements according to ISO 21360-1, which is described under "5.1 Volume flow rate measurement by the throughput method".

Several sensors with different measuring ranges are used to measure the pressure and the volume flow.

Vacuum pump test bench

Compressor test bench

With the compressor test bench the performance and efficiency of refrigerant compressors can be determined.

For this purpose, the desired pressure and temperature conditions are set and the test stand measures the mass flow and electrical power consumption of the compressor under these conditions.

The measured refrigerant mass flow is measured directly with two Coriolis mass flow sensors. All important measured values ​​are recorded redundantly and the temperature sensors are positioned within the refrigerant lines.

Compressors of the size used in heat pumps for family houses can be tested.

Compressor test bench
Compressor test bench

Thermal camera

The institute provides a thermographic camera FLIR T650sc with a resolution of 640 x 480 pixels. The thermal camera is a very useful tool in the field of power electronics development as well as in the development and initial operation of thermal systems.

  • IR resolution: 640 × 480
  • Integrated daylight camera
  • Temperature-calibrated video recording at 30 fps
  • MSX® image enhancement technology
Thermographic camera

Data acquisition

Mit der dazugehörigen Hardware ComapctRio können verschiedenste Sensoren, wie z.B. Temperatursensoren, Strömungssensoren, Leistungssensoren, usw. gleichzeitig aufgezeichnet werden.

For data acquisition mainly National Instruments' measurement systems are used.

The staff of the institute is developing separate control programs for each new test bench with the software LabView from National Instruments. This program not only controls the test benches directly from the computer, but also measures and evaluates the measured values ​​of the sensors.

With the associated ComapctRio hardware, various sensors such as, temperature sensors, flow sensors, power sensors, etc. can be simultaneously recorded.


  • CompactRio (cRio)
  • NI measurement cards of different types for CompactRio (cRio)
CompactRio for data acquisition

Measuring instruments

The Insititute for Energy Systems IES is capable of recording different measurement variables with many different sensor types. The sensors can be used for various fluids in different phases (liquid, gaseous). The following sensors can be applied:

  • Volumetric flow sensors (liquid, gaseous)
  • Coriolis sensors
  • Temperature sensors
  • Enthalpy and moisture sensors
  • Pressure sensors (absolute, differential)

In addition to the sensors and the measurements at the institute, we can also access various data loggers in order to analyse and measure systems on site and during operation.

Measuring instruments